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Valavičius made his professional debut in August 2000 in the RINGS promotion. He fought for RINGS in his first seven fights ending with a record of 4 wins and 3 losses. One of those losses was to future PRIDE Heavyweight champion Fedor Emelianenko.

For the first 12 years of his career, he fought in Japan and Eastern European countries such as his native Lithuania, Poland, Russia, and Czech Republic. Valavičius made his North American debut in Chicago, Illinois in August 2012.